April 8, 2016 - For the first time, SpaceX successfully lands its Falcon 9 rocket on a drone ship.

March 30, 2017 - SpaceX successfully launches a used rocket. This is the first time in the history of spaceflight that the same rocket has been used on two separate missions to orbit.

June 1, 2017 - Quits two of President Donald Trump's business advisory councils after the president announces he will pull the US out of the historic Paris climate agreement. Musk tweets, "Am departing presidential councils. Climate change is real. Leaving Paris is not good for America or the world."

February 6, 2018 - SpaceX launches Falcon Heavy, the world's most powerful rocket. The more thrust a rocket has, the farther it can travel and the bigger the satellite, spacecraft or other payload it can send into orbit. This opens a range of business opportunities for SpaceX.